x86, nmi_watchdog: Remove ARCH_HAS_NMI_WATCHDOG and rely on CONFIG_HARDLOCKUP_DETECTOR
[linux-2.6.git] / drivers / watchdog / hpwdt.c
1 /*
2  *      HP WatchDog Driver
3  *      based on
4  *
5  *      SoftDog 0.05:   A Software Watchdog Device
6  *
7  *      (c) Copyright 2007 Hewlett-Packard Development Company, L.P.
8  *      Thomas Mingarelli <thomas.mingarelli@hp.com>
9  *
10  *      This program is free software; you can redistribute it and/or
11  *      modify it under the terms of the GNU General Public License
12  *      version 2 as published by the Free Software Foundation
13  *
14  */
15
16 #include <linux/device.h>
17 #include <linux/fs.h>
18 #include <linux/init.h>
19 #include <linux/io.h>
20 #include <linux/bitops.h>
21 #include <linux/kernel.h>
22 #include <linux/miscdevice.h>
23 #include <linux/module.h>
24 #include <linux/moduleparam.h>
25 #include <linux/pci.h>
26 #include <linux/pci_ids.h>
27 #include <linux/types.h>
28 #include <linux/uaccess.h>
29 #include <linux/watchdog.h>
30 #ifdef CONFIG_HPWDT_NMI_DECODING
31 #include <linux/dmi.h>
32 #include <linux/spinlock.h>
33 #include <linux/nmi.h>
34 #include <linux/kdebug.h>
35 #include <linux/notifier.h>
36 #include <asm/cacheflush.h>
37 #endif /* CONFIG_HPWDT_NMI_DECODING */
38
39 #define HPWDT_VERSION                   "1.2.0"
40 #define SECS_TO_TICKS(secs)             ((secs) * 1000 / 128)
41 #define TICKS_TO_SECS(ticks)            ((ticks) * 128 / 1000)
42 #define HPWDT_MAX_TIMER                 TICKS_TO_SECS(65535)
43 #define DEFAULT_MARGIN                  30
44
45 static unsigned int soft_margin = DEFAULT_MARGIN;       /* in seconds */
46 static unsigned int reload;                     /* the computed soft_margin */
47 static int nowayout = WATCHDOG_NOWAYOUT;
48 static char expect_release;
49 static unsigned long hpwdt_is_open;
50
51 static void __iomem *pci_mem_addr;              /* the PCI-memory address */
52 static unsigned long __iomem *hpwdt_timer_reg;
53 static unsigned long __iomem *hpwdt_timer_con;
54
55 static struct pci_device_id hpwdt_devices[] = {
56         { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB203) },   /* iLO2 */
57         { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3306) },       /* iLO3 */
58         {0},                    /* terminate list */
59 };
60 MODULE_DEVICE_TABLE(pci, hpwdt_devices);
61
62 #ifdef CONFIG_HPWDT_NMI_DECODING
63 #define PCI_BIOS32_SD_VALUE             0x5F32335F      /* "_32_" */
64 #define CRU_BIOS_SIGNATURE_VALUE        0x55524324
65 #define PCI_BIOS32_PARAGRAPH_LEN        16
66 #define PCI_ROM_BASE1                   0x000F0000
67 #define ROM_SIZE                        0x10000
68
69 struct bios32_service_dir {
70         u32 signature;
71         u32 entry_point;
72         u8 revision;
73         u8 length;
74         u8 checksum;
75         u8 reserved[5];
76 };
77
78 /* type 212 */
79 struct smbios_cru64_info {
80         u8 type;
81         u8 byte_length;
82         u16 handle;
83         u32 signature;
84         u64 physical_address;
85         u32 double_length;
86         u32 double_offset;
87 };
88 #define SMBIOS_CRU64_INFORMATION        212
89
90 struct cmn_registers {
91         union {
92                 struct {
93                         u8 ral;
94                         u8 rah;
95                         u16 rea2;
96                 };
97                 u32 reax;
98         } u1;
99         union {
100                 struct {
101                         u8 rbl;
102                         u8 rbh;
103                         u8 reb2l;
104                         u8 reb2h;
105                 };
106                 u32 rebx;
107         } u2;
108         union {
109                 struct {
110                         u8 rcl;
111                         u8 rch;
112                         u16 rec2;
113                 };
114                 u32 recx;
115         } u3;
116         union {
117                 struct {
118                         u8 rdl;
119                         u8 rdh;
120                         u16 red2;
121                 };
122                 u32 redx;
123         } u4;
124
125         u32 resi;
126         u32 redi;
127         u16 rds;
128         u16 res;
129         u32 reflags;
130 }  __attribute__((packed));
131
132 static unsigned int hpwdt_nmi_decoding;
133 static unsigned int allow_kdump;
134 static unsigned int priority;           /* hpwdt at end of die_notify list */
135 static DEFINE_SPINLOCK(rom_lock);
136 static void *cru_rom_addr;
137 static struct cmn_registers cmn_regs;
138
139 extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs,
140                                                 unsigned long *pRomEntry);
141
142 #ifdef CONFIG_X86_32
143 /* --32 Bit Bios------------------------------------------------------------ */
144
145 #define HPWDT_ARCH      32
146
147 asm(".text                          \n\t"
148     ".align 4                       \n"
149     "asminline_call:                \n\t"
150     "pushl       %ebp               \n\t"
151     "movl        %esp, %ebp         \n\t"
152     "pusha                          \n\t"
153     "pushf                          \n\t"
154     "push        %es                \n\t"
155     "push        %ds                \n\t"
156     "pop         %es                \n\t"
157     "movl        8(%ebp),%eax       \n\t"
158     "movl        4(%eax),%ebx       \n\t"
159     "movl        8(%eax),%ecx       \n\t"
160     "movl        12(%eax),%edx      \n\t"
161     "movl        16(%eax),%esi      \n\t"
162     "movl        20(%eax),%edi      \n\t"
163     "movl        (%eax),%eax        \n\t"
164     "push        %cs                \n\t"
165     "call        *12(%ebp)          \n\t"
166     "pushf                          \n\t"
167     "pushl       %eax               \n\t"
168     "movl        8(%ebp),%eax       \n\t"
169     "movl        %ebx,4(%eax)       \n\t"
170     "movl        %ecx,8(%eax)       \n\t"
171     "movl        %edx,12(%eax)      \n\t"
172     "movl        %esi,16(%eax)      \n\t"
173     "movl        %edi,20(%eax)      \n\t"
174     "movw        %ds,24(%eax)       \n\t"
175     "movw        %es,26(%eax)       \n\t"
176     "popl        %ebx               \n\t"
177     "movl        %ebx,(%eax)        \n\t"
178     "popl        %ebx               \n\t"
179     "movl        %ebx,28(%eax)      \n\t"
180     "pop         %es                \n\t"
181     "popf                           \n\t"
182     "popa                           \n\t"
183     "leave                          \n\t"
184     "ret                            \n\t"
185     ".previous");
186
187
188 /*
189  *      cru_detect
190  *
191  *      Routine Description:
192  *      This function uses the 32-bit BIOS Service Directory record to
193  *      search for a $CRU record.
194  *
195  *      Return Value:
196  *      0        :  SUCCESS
197  *      <0       :  FAILURE
198  */
199 static int __devinit cru_detect(unsigned long map_entry,
200         unsigned long map_offset)
201 {
202         void *bios32_map;
203         unsigned long *bios32_entrypoint;
204         unsigned long cru_physical_address;
205         unsigned long cru_length;
206         unsigned long physical_bios_base = 0;
207         unsigned long physical_bios_offset = 0;
208         int retval = -ENODEV;
209
210         bios32_map = ioremap(map_entry, (2 * PAGE_SIZE));
211
212         if (bios32_map == NULL)
213                 return -ENODEV;
214
215         bios32_entrypoint = bios32_map + map_offset;
216
217         cmn_regs.u1.reax = CRU_BIOS_SIGNATURE_VALUE;
218
219         asminline_call(&cmn_regs, bios32_entrypoint);
220
221         if (cmn_regs.u1.ral != 0) {
222                 printk(KERN_WARNING
223                         "hpwdt: Call succeeded but with an error: 0x%x\n",
224                         cmn_regs.u1.ral);
225         } else {
226                 physical_bios_base = cmn_regs.u2.rebx;
227                 physical_bios_offset = cmn_regs.u4.redx;
228                 cru_length = cmn_regs.u3.recx;
229                 cru_physical_address =
230                         physical_bios_base + physical_bios_offset;
231
232                 /* If the values look OK, then map it in. */
233                 if ((physical_bios_base + physical_bios_offset)) {
234                         cru_rom_addr =
235                                 ioremap(cru_physical_address, cru_length);
236                         if (cru_rom_addr)
237                                 retval = 0;
238                 }
239
240                 printk(KERN_DEBUG "hpwdt: CRU Base Address:   0x%lx\n",
241                         physical_bios_base);
242                 printk(KERN_DEBUG "hpwdt: CRU Offset Address: 0x%lx\n",
243                         physical_bios_offset);
244                 printk(KERN_DEBUG "hpwdt: CRU Length:         0x%lx\n",
245                         cru_length);
246                 printk(KERN_DEBUG "hpwdt: CRU Mapped Address: %p\n",
247                         &cru_rom_addr);
248         }
249         iounmap(bios32_map);
250         return retval;
251 }
252
253 /*
254  *      bios_checksum
255  */
256 static int __devinit bios_checksum(const char __iomem *ptr, int len)
257 {
258         char sum = 0;
259         int i;
260
261         /*
262          * calculate checksum of size bytes. This should add up
263          * to zero if we have a valid header.
264          */
265         for (i = 0; i < len; i++)
266                 sum += ptr[i];
267
268         return ((sum == 0) && (len > 0));
269 }
270
271 /*
272  *      bios32_present
273  *
274  *      Routine Description:
275  *      This function finds the 32-bit BIOS Service Directory
276  *
277  *      Return Value:
278  *      0        :  SUCCESS
279  *      <0       :  FAILURE
280  */
281 static int __devinit bios32_present(const char __iomem *p)
282 {
283         struct bios32_service_dir *bios_32_ptr;
284         int length;
285         unsigned long map_entry, map_offset;
286
287         bios_32_ptr = (struct bios32_service_dir *) p;
288
289         /*
290          * Search for signature by checking equal to the swizzled value
291          * instead of calling another routine to perform a strcmp.
292          */
293         if (bios_32_ptr->signature == PCI_BIOS32_SD_VALUE) {
294                 length = bios_32_ptr->length * PCI_BIOS32_PARAGRAPH_LEN;
295                 if (bios_checksum(p, length)) {
296                         /*
297                          * According to the spec, we're looking for the
298                          * first 4KB-aligned address below the entrypoint
299                          * listed in the header. The Service Directory code
300                          * is guaranteed to occupy no more than 2 4KB pages.
301                          */
302                         map_entry = bios_32_ptr->entry_point & ~(PAGE_SIZE - 1);
303                         map_offset = bios_32_ptr->entry_point - map_entry;
304
305                         return cru_detect(map_entry, map_offset);
306                 }
307         }
308         return -ENODEV;
309 }
310
311 static int __devinit detect_cru_service(void)
312 {
313         char __iomem *p, *q;
314         int rc = -1;
315
316         /*
317          * Search from 0x0f0000 through 0x0fffff, inclusive.
318          */
319         p = ioremap(PCI_ROM_BASE1, ROM_SIZE);
320         if (p == NULL)
321                 return -ENOMEM;
322
323         for (q = p; q < p + ROM_SIZE; q += 16) {
324                 rc = bios32_present(q);
325                 if (!rc)
326                         break;
327         }
328         iounmap(p);
329         return rc;
330 }
331 /* ------------------------------------------------------------------------- */
332 #endif /* CONFIG_X86_32 */
333 #ifdef CONFIG_X86_64
334 /* --64 Bit Bios------------------------------------------------------------ */
335
336 #define HPWDT_ARCH      64
337
338 asm(".text                      \n\t"
339     ".align 4                   \n"
340     "asminline_call:            \n\t"
341     "pushq      %rbp            \n\t"
342     "movq       %rsp, %rbp      \n\t"
343     "pushq      %rax            \n\t"
344     "pushq      %rbx            \n\t"
345     "pushq      %rdx            \n\t"
346     "pushq      %r12            \n\t"
347     "pushq      %r9             \n\t"
348     "movq       %rsi, %r12      \n\t"
349     "movq       %rdi, %r9       \n\t"
350     "movl       4(%r9),%ebx     \n\t"
351     "movl       8(%r9),%ecx     \n\t"
352     "movl       12(%r9),%edx    \n\t"
353     "movl       16(%r9),%esi    \n\t"
354     "movl       20(%r9),%edi    \n\t"
355     "movl       (%r9),%eax      \n\t"
356     "call       *%r12           \n\t"
357     "pushfq                     \n\t"
358     "popq        %r12           \n\t"
359     "movl       %eax, (%r9)     \n\t"
360     "movl       %ebx, 4(%r9)    \n\t"
361     "movl       %ecx, 8(%r9)    \n\t"
362     "movl       %edx, 12(%r9)   \n\t"
363     "movl       %esi, 16(%r9)   \n\t"
364     "movl       %edi, 20(%r9)   \n\t"
365     "movq       %r12, %rax      \n\t"
366     "movl       %eax, 28(%r9)   \n\t"
367     "popq       %r9             \n\t"
368     "popq       %r12            \n\t"
369     "popq       %rdx            \n\t"
370     "popq       %rbx            \n\t"
371     "popq       %rax            \n\t"
372     "leave                      \n\t"
373     "ret                        \n\t"
374     ".previous");
375
376 /*
377  *      dmi_find_cru
378  *
379  *      Routine Description:
380  *      This function checks whether or not a SMBIOS/DMI record is
381  *      the 64bit CRU info or not
382  */
383 static void __devinit dmi_find_cru(const struct dmi_header *dm, void *dummy)
384 {
385         struct smbios_cru64_info *smbios_cru64_ptr;
386         unsigned long cru_physical_address;
387
388         if (dm->type == SMBIOS_CRU64_INFORMATION) {
389                 smbios_cru64_ptr = (struct smbios_cru64_info *) dm;
390                 if (smbios_cru64_ptr->signature == CRU_BIOS_SIGNATURE_VALUE) {
391                         cru_physical_address =
392                                 smbios_cru64_ptr->physical_address +
393                                 smbios_cru64_ptr->double_offset;
394                         cru_rom_addr = ioremap(cru_physical_address,
395                                 smbios_cru64_ptr->double_length);
396                         set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK,
397                                 smbios_cru64_ptr->double_length >> PAGE_SHIFT);
398                 }
399         }
400 }
401
402 static int __devinit detect_cru_service(void)
403 {
404         cru_rom_addr = NULL;
405
406         dmi_walk(dmi_find_cru, NULL);
407
408         /* if cru_rom_addr has been set then we found a CRU service */
409         return ((cru_rom_addr != NULL) ? 0 : -ENODEV);
410 }
411 /* ------------------------------------------------------------------------- */
412 #endif /* CONFIG_X86_64 */
413 #endif /* CONFIG_HPWDT_NMI_DECODING */
414
415 /*
416  *      Watchdog operations
417  */
418 static void hpwdt_start(void)
419 {
420         reload = SECS_TO_TICKS(soft_margin);
421         iowrite16(reload, hpwdt_timer_reg);
422         iowrite16(0x85, hpwdt_timer_con);
423 }
424
425 static void hpwdt_stop(void)
426 {
427         unsigned long data;
428
429         data = ioread16(hpwdt_timer_con);
430         data &= 0xFE;
431         iowrite16(data, hpwdt_timer_con);
432 }
433
434 static void hpwdt_ping(void)
435 {
436         iowrite16(reload, hpwdt_timer_reg);
437 }
438
439 static int hpwdt_change_timer(int new_margin)
440 {
441         if (new_margin < 1 || new_margin > HPWDT_MAX_TIMER) {
442                 printk(KERN_WARNING
443                         "hpwdt: New value passed in is invalid: %d seconds.\n",
444                         new_margin);
445                 return -EINVAL;
446         }
447
448         soft_margin = new_margin;
449         printk(KERN_DEBUG
450                 "hpwdt: New timer passed in is %d seconds.\n",
451                 new_margin);
452         reload = SECS_TO_TICKS(soft_margin);
453
454         return 0;
455 }
456
457 static int hpwdt_time_left(void)
458 {
459         return TICKS_TO_SECS(ioread16(hpwdt_timer_reg));
460 }
461
462 #ifdef CONFIG_HPWDT_NMI_DECODING
463 /*
464  *      NMI Handler
465  */
466 static int hpwdt_pretimeout(struct notifier_block *nb, unsigned long ulReason,
467                                 void *data)
468 {
469         unsigned long rom_pl;
470         static int die_nmi_called;
471
472         if (ulReason != DIE_NMI && ulReason != DIE_NMI_IPI)
473                 goto out;
474
475         if (!hpwdt_nmi_decoding)
476                 goto out;
477
478         spin_lock_irqsave(&rom_lock, rom_pl);
479         if (!die_nmi_called)
480                 asminline_call(&cmn_regs, cru_rom_addr);
481         die_nmi_called = 1;
482         spin_unlock_irqrestore(&rom_lock, rom_pl);
483         if (cmn_regs.u1.ral == 0) {
484                 printk(KERN_WARNING "hpwdt: An NMI occurred, "
485                         "but unable to determine source.\n");
486         } else {
487                 if (allow_kdump)
488                         hpwdt_stop();
489                 panic("An NMI occurred, please see the Integrated "
490                         "Management Log for details.\n");
491         }
492 out:
493         return NOTIFY_OK;
494 }
495 #endif /* CONFIG_HPWDT_NMI_DECODING */
496
497 /*
498  *      /dev/watchdog handling
499  */
500 static int hpwdt_open(struct inode *inode, struct file *file)
501 {
502         /* /dev/watchdog can only be opened once */
503         if (test_and_set_bit(0, &hpwdt_is_open))
504                 return -EBUSY;
505
506         /* Start the watchdog */
507         hpwdt_start();
508         hpwdt_ping();
509
510         return nonseekable_open(inode, file);
511 }
512
513 static int hpwdt_release(struct inode *inode, struct file *file)
514 {
515         /* Stop the watchdog */
516         if (expect_release == 42) {
517                 hpwdt_stop();
518         } else {
519                 printk(KERN_CRIT
520                         "hpwdt: Unexpected close, not stopping watchdog!\n");
521                 hpwdt_ping();
522         }
523
524         expect_release = 0;
525
526         /* /dev/watchdog is being closed, make sure it can be re-opened */
527         clear_bit(0, &hpwdt_is_open);
528
529         return 0;
530 }
531
532 static ssize_t hpwdt_write(struct file *file, const char __user *data,
533         size_t len, loff_t *ppos)
534 {
535         /* See if we got the magic character 'V' and reload the timer */
536         if (len) {
537                 if (!nowayout) {
538                         size_t i;
539
540                         /* note: just in case someone wrote the magic character
541                          * five months ago... */
542                         expect_release = 0;
543
544                         /* scan to see whether or not we got the magic char. */
545                         for (i = 0; i != len; i++) {
546                                 char c;
547                                 if (get_user(c, data + i))
548                                         return -EFAULT;
549                                 if (c == 'V')
550                                         expect_release = 42;
551                         }
552                 }
553
554                 /* someone wrote to us, we should reload the timer */
555                 hpwdt_ping();
556         }
557
558         return len;
559 }
560
561 static const struct watchdog_info ident = {
562         .options = WDIOF_SETTIMEOUT |
563                    WDIOF_KEEPALIVEPING |
564                    WDIOF_MAGICCLOSE,
565         .identity = "HP iLO2+ HW Watchdog Timer",
566 };
567
568 static long hpwdt_ioctl(struct file *file, unsigned int cmd,
569         unsigned long arg)
570 {
571         void __user *argp = (void __user *)arg;
572         int __user *p = argp;
573         int new_margin;
574         int ret = -ENOTTY;
575
576         switch (cmd) {
577         case WDIOC_GETSUPPORT:
578                 ret = 0;
579                 if (copy_to_user(argp, &ident, sizeof(ident)))
580                         ret = -EFAULT;
581                 break;
582
583         case WDIOC_GETSTATUS:
584         case WDIOC_GETBOOTSTATUS:
585                 ret = put_user(0, p);
586                 break;
587
588         case WDIOC_KEEPALIVE:
589                 hpwdt_ping();
590                 ret = 0;
591                 break;
592
593         case WDIOC_SETTIMEOUT:
594                 ret = get_user(new_margin, p);
595                 if (ret)
596                         break;
597
598                 ret = hpwdt_change_timer(new_margin);
599                 if (ret)
600                         break;
601
602                 hpwdt_ping();
603                 /* Fall */
604         case WDIOC_GETTIMEOUT:
605                 ret = put_user(soft_margin, p);
606                 break;
607
608         case WDIOC_GETTIMELEFT:
609                 ret = put_user(hpwdt_time_left(), p);
610                 break;
611         }
612         return ret;
613 }
614
615 /*
616  *      Kernel interfaces
617  */
618 static const struct file_operations hpwdt_fops = {
619         .owner = THIS_MODULE,
620         .llseek = no_llseek,
621         .write = hpwdt_write,
622         .unlocked_ioctl = hpwdt_ioctl,
623         .open = hpwdt_open,
624         .release = hpwdt_release,
625 };
626
627 static struct miscdevice hpwdt_miscdev = {
628         .minor = WATCHDOG_MINOR,
629         .name = "watchdog",
630         .fops = &hpwdt_fops,
631 };
632
633 #ifdef CONFIG_HPWDT_NMI_DECODING
634 static struct notifier_block die_notifier = {
635         .notifier_call = hpwdt_pretimeout,
636         .priority = 0,
637 };
638 #endif /* CONFIG_HPWDT_NMI_DECODING */
639
640 /*
641  *      Init & Exit
642  */
643
644 #ifdef CONFIG_HPWDT_NMI_DECODING
645 #ifdef CONFIG_X86_LOCAL_APIC
646 static void __devinit hpwdt_check_nmi_decoding(struct pci_dev *dev)
647 {
648         /*
649          * If nmi_watchdog is turned off then we can turn on
650          * our nmi decoding capability.
651          */
652         hpwdt_nmi_decoding = 1;
653 }
654 #else
655 static void __devinit hpwdt_check_nmi_decoding(struct pci_dev *dev)
656 {
657         dev_warn(&dev->dev, "NMI decoding is disabled. "
658                 "Your kernel does not support a NMI Watchdog.\n");
659 }
660 #endif /* CONFIG_X86_LOCAL_APIC */
661
662 static int __devinit hpwdt_init_nmi_decoding(struct pci_dev *dev)
663 {
664         int retval;
665
666         /*
667          * We need to map the ROM to get the CRU service.
668          * For 32 bit Operating Systems we need to go through the 32 Bit
669          * BIOS Service Directory
670          * For 64 bit Operating Systems we get that service through SMBIOS.
671          */
672         retval = detect_cru_service();
673         if (retval < 0) {
674                 dev_warn(&dev->dev,
675                         "Unable to detect the %d Bit CRU Service.\n",
676                         HPWDT_ARCH);
677                 return retval;
678         }
679
680         /*
681          * We know this is the only CRU call we need to make so lets keep as
682          * few instructions as possible once the NMI comes in.
683          */
684         cmn_regs.u1.rah = 0x0D;
685         cmn_regs.u1.ral = 0x02;
686
687         /*
688          * If the priority is set to 1, then we will be put first on the
689          * die notify list to handle a critical NMI. The default is to
690          * be last so other users of the NMI signal can function.
691          */
692         if (priority)
693                 die_notifier.priority = 0x7FFFFFFF;
694
695         retval = register_die_notifier(&die_notifier);
696         if (retval != 0) {
697                 dev_warn(&dev->dev,
698                         "Unable to register a die notifier (err=%d).\n",
699                         retval);
700                 if (cru_rom_addr)
701                         iounmap(cru_rom_addr);
702         }
703
704         dev_info(&dev->dev,
705                         "HP Watchdog Timer Driver: NMI decoding initialized"
706                         ", allow kernel dump: %s (default = 0/OFF)"
707                         ", priority: %s (default = 0/LAST).\n",
708                         (allow_kdump == 0) ? "OFF" : "ON",
709                         (priority == 0) ? "LAST" : "FIRST");
710         return 0;
711 }
712
713 static void __devexit hpwdt_exit_nmi_decoding(void)
714 {
715         unregister_die_notifier(&die_notifier);
716         if (cru_rom_addr)
717                 iounmap(cru_rom_addr);
718 }
719 #else /* !CONFIG_HPWDT_NMI_DECODING */
720 static void __devinit hpwdt_check_nmi_decoding(struct pci_dev *dev)
721 {
722 }
723
724 static int __devinit hpwdt_init_nmi_decoding(struct pci_dev *dev)
725 {
726         return 0;
727 }
728
729 static void __devexit hpwdt_exit_nmi_decoding(void)
730 {
731 }
732 #endif /* CONFIG_HPWDT_NMI_DECODING */
733
734 static int __devinit hpwdt_init_one(struct pci_dev *dev,
735                                         const struct pci_device_id *ent)
736 {
737         int retval;
738
739         /*
740          * Check if we can do NMI decoding or not
741          */
742         hpwdt_check_nmi_decoding(dev);
743
744         /*
745          * First let's find out if we are on an iLO2+ server. We will
746          * not run on a legacy ASM box.
747          * So we only support the G5 ProLiant servers and higher.
748          */
749         if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) {
750                 dev_warn(&dev->dev,
751                         "This server does not have an iLO2+ ASIC.\n");
752                 return -ENODEV;
753         }
754
755         if (pci_enable_device(dev)) {
756                 dev_warn(&dev->dev,
757                         "Not possible to enable PCI Device: 0x%x:0x%x.\n",
758                         ent->vendor, ent->device);
759                 return -ENODEV;
760         }
761
762         pci_mem_addr = pci_iomap(dev, 1, 0x80);
763         if (!pci_mem_addr) {
764                 dev_warn(&dev->dev,
765                         "Unable to detect the iLO2+ server memory.\n");
766                 retval = -ENOMEM;
767                 goto error_pci_iomap;
768         }
769         hpwdt_timer_reg = pci_mem_addr + 0x70;
770         hpwdt_timer_con = pci_mem_addr + 0x72;
771
772         /* Make sure that we have a valid soft_margin */
773         if (hpwdt_change_timer(soft_margin))
774                 hpwdt_change_timer(DEFAULT_MARGIN);
775
776         /* Initialize NMI Decoding functionality */
777         retval = hpwdt_init_nmi_decoding(dev);
778         if (retval != 0)
779                 goto error_init_nmi_decoding;
780
781         retval = misc_register(&hpwdt_miscdev);
782         if (retval < 0) {
783                 dev_warn(&dev->dev,
784                         "Unable to register miscdev on minor=%d (err=%d).\n",
785                         WATCHDOG_MINOR, retval);
786                 goto error_misc_register;
787         }
788
789         dev_info(&dev->dev, "HP Watchdog Timer Driver: %s"
790                         ", timer margin: %d seconds (nowayout=%d).\n",
791                         HPWDT_VERSION, soft_margin, nowayout);
792         return 0;
793
794 error_misc_register:
795         hpwdt_exit_nmi_decoding();
796 error_init_nmi_decoding:
797         pci_iounmap(dev, pci_mem_addr);
798 error_pci_iomap:
799         pci_disable_device(dev);
800         return retval;
801 }
802
803 static void __devexit hpwdt_exit(struct pci_dev *dev)
804 {
805         if (!nowayout)
806                 hpwdt_stop();
807
808         misc_deregister(&hpwdt_miscdev);
809         hpwdt_exit_nmi_decoding();
810         pci_iounmap(dev, pci_mem_addr);
811         pci_disable_device(dev);
812 }
813
814 static struct pci_driver hpwdt_driver = {
815         .name = "hpwdt",
816         .id_table = hpwdt_devices,
817         .probe = hpwdt_init_one,
818         .remove = __devexit_p(hpwdt_exit),
819 };
820
821 static void __exit hpwdt_cleanup(void)
822 {
823         pci_unregister_driver(&hpwdt_driver);
824 }
825
826 static int __init hpwdt_init(void)
827 {
828         return pci_register_driver(&hpwdt_driver);
829 }
830
831 MODULE_AUTHOR("Tom Mingarelli");
832 MODULE_DESCRIPTION("hp watchdog driver");
833 MODULE_LICENSE("GPL");
834 MODULE_VERSION(HPWDT_VERSION);
835 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
836
837 module_param(soft_margin, int, 0);
838 MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
839
840 module_param(nowayout, int, 0);
841 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
842                 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
843
844 #ifdef CONFIG_HPWDT_NMI_DECODING
845 module_param(allow_kdump, int, 0);
846 MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs");
847
848 module_param(priority, int, 0);
849 MODULE_PARM_DESC(priority, "The hpwdt driver handles NMIs first or last"
850                 " (default = 0/Last)\n");
851 #endif /* !CONFIG_HPWDT_NMI_DECODING */
852
853 module_init(hpwdt_init);
854 module_exit(hpwdt_cleanup);